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Jeon, Jong Hun (Yonsei University)

PLB 664,84 (2008). Jeon, Jong Hun (Yonsei University). with C.S. Kim and Seungwon Baek. Outline. B factories have produced a lot of interesting results, particularly in measuring indirect CPV in the B system

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Jeon, Jong Hun (Yonsei University)

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  1. PLB 664,84 (2008) Jeon, Jong Hun (Yonsei University) with C.S. Kim and Seungwon Baek KISTI_Z prime_ JHJeon

  2. Outline KISTI_Z prime_ JHJeon

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  4. B factories have produced a lot of interesting results, particularly in measuring indirect CPV in the B system • sin2β=0.6750.026 from ΨKS data (HFAG)indicating that B physics isentering a precision era • Finally, we have recently observed direct CPV in B system • ( ACP( Bd→π+K-)=-0.0980.012 (HFAG)) • Most branching ratios of charmless B P P and P V are currently measured with errors about 10%∼20% (mostly based upon 100M B anti-B pairs) 5% ∼ 10% errors on amplitudes • One hopes to have <5% errors on the amplitudes of most modes more precise information on α and γ (<10±) KISTI_Z prime_ JHJeon

  5. Bs Mixing Experimental result Lattice QCD result KISTI_Z prime_ JHJeon

  6. BRs Experimental results PQCD results KISTI_Z prime_ JHJeon

  7. DirectCP Asymmetries Experimental results PQCD results KISTI_Z prime_ JHJeon

  8. Mixing-induced CP Asymmetries Experimental results PQCD results KISTI_Z prime_ JHJeon

  9. FCNCs in SM T P KISTI_Z prime_ JHJeon

  10. Leptophobic Z’ Model • Extra neutral U(1) gauge boson, Z’ • - has been considered one of the extensions of the SM • - motivated by • String-inspired GUTs (J.L.Hewett, T.G.Rizzo, M.Cvetic, P.Langacker, etc) • Dynamical symmetry breaking models (G.Buchalla, G.Burdman, etc) • Extra dimension models (M.Masip, A.Pomarol) • Little higgs models (N.Arkani-Hamed, A.G.Cohen, T.Han, etc) • Leptophobic Z’ • - does not couple to SM leptons • - introduced to explain the Rb-Rc puzzle at LEP and • anomalous high-ET jet cross section at CDF • - by introducing the superstring inspired models, • i.e., E6 or Flipped SU(5) KISTI_Z prime_ JHJeon

  11. comes from heterotic superstring ( ) • was the natural anomaly free choice for a GUT group after SO(10) • could have several intermediate mass breaking scales • Maximal breakings of E6 : If we consider the following breaking chain U(1)’ can be a linear combination of KISTI_Z prime_ JHJeon

  12. directly SU(5) → SM : SU(5) (Geogri-Glashow) • SU(5)XU(1)χ→ SM : Flipped SU(5) (S.M.Barr,1982) • Flipped SU(5) is a different breaking pattern of SO(10) Leptophobic Z’ does not couple to multiplet(f) and singlet(lc) KISTI_Z prime_ JHJeon

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  19. Large Small Conventional Hierarchy in B→Kπ KISTI_Z prime_ JHJeon

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  28. Summary KISTI_Z prime_ JHJeon

  29. Back up KISTI_Z prime_ JHJeon

  30. Beauty in the B Meson • The beauty of B mesons lies in its large mass or the mass hierarchy: • In the heavy quark limit, mQ 1, we discover: • Flavor symmetry:dynamics unchanged under heavy flavor exchange (b  c), corrections incorporated in powers of 1/mb–1/mc; • Spin symmetry:dynamics unchanged under heavy quark spin flips, corrections incorporated in powers of 1/mb. • B mesons provide an ideal system for studying heavy-to-heavy transitions. • Much progress has been made in understanding heavy-to-light transitions in recent years: • Perturbative approach:naïve factorization, generalized factorization, QCD-improved factorization, pQCD, and SCET; • Nonperturbative approach:flavor SU(3) symmetry. KISTI_Z prime_ JHJeon

  31. OPE (Operator Product Expansion ) Rev.Mod.Phys.68,1125(1996) KISTI_Z prime_ JHJeon

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